Receipt-free electronic auction schemes using homomorphic encryption

Abstract. Bid-rigging is a dangerous attack in electronic auction. Abe and Suzuki firstly introduced the idea of receipt-free to prevent this at-tack. In this paper we point out that Abe and Suzuki’s scheme only provides receipt-freeness for losing bidders. We argue that it is more important to provide receipt-freeness for winners and propose a new receipt-free sealed bid auction scheme using the homomorphic encryp-tion technique. In contrast to Abe and Suzuki’s scheme, our scheme sat-isfies privacy, correctness, public verifiability and receipt-freeness for all bidders. Also, our scheme is not based on threshold trust model but three-party trust model, so it is more suitable for real-life auction. Furthermore, we extend our scheme to M + 1-st price receipt-free auction